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FILE - In this Aug. 27, 2008 file photo, Luci Baines Johnson, left, and her sister, Lynda Johnson Robb talk during ceremonies to commemorate the 100th birthday of their father, former president Lyndon Baines Johnson at the family cemetery on the LBJ Ranch, located near Stonewall, Texas. A family spokesman says Luci Baines Johnson, the youngest daughter of former President Lyndon Johnson, is being treated at the Mayo Clinic for what doctors suspect is a rare autoimmune disorder that affects the nervous system. (AP Photo/Harry Cabluck, File)
/ AP